14 



Indian Economic Entomology. 



[ YoL 11. 



down and moult^ as tbeir mother did before them. This asexual repro- 

 duction o£ wingless females goes on through a number of generations 

 until the autumn, when winged asexual females are produced. These 

 winged asexual females produce the wingless sexual form, from which, 

 after copulation, the single winter egg is produced. The root and branch 

 inhabiting forms belong to one and the same species. The galls on 

 both roots and branches are morbid growths of the vegetable tissues, 

 due to the irritation set up by the wingless females in feeding upon the 

 plant. The downy excretion with whieli these females are covered 

 serves to a great extent to protect them from the weather. Honey tubes 

 are absent, so the insect is not protected by ants. 



In Peshin, Baluchistan, according to Mr. J. Cleghorn, the poplar 

 Baluchistan Poplar Borer. 



